An analysis of social media usage reveals the real-estate agents with the most Twitter followers.

Spread Sheet wondered how many "tweets" go out each day from real-estate agents and offices using Twitter accounts to promote listings, open houses and other real-estate news. The answer: about half a tweet a day, per agent, statistically speaking.

Klout, the social-media analytics company, searched millions of Twitter accounts and identified more than 80,000 Twitter...